Where DO these silly sayings come from?

Where DO these silly sayings come from?

Bignuf Bignuf
Anyone know the origin of "FLY BY THE SEAT OF YOUR PANTS"?

Any other "odd" sayings you can think of, without obvious "reason" us for saying it?
11/09/2011
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Ghost Ghost
As for that phrase, I checked Yahoo: link
11/10/2011
Total posts: 2
Unique posters: 2